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wiphy: check SAE offload in wiphy_select_akm

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This allows an SAE AKM to be selected if the hardware does not
support SAE in userspace, but does support SAE offload.
This commit is contained in:
James Prestwood 2021-03-22 09:01:52 -07:00 committed by Denis Kenzior
parent af3d0d21a0
commit 3e3ef284de
1 changed files with 47 additions and 12 deletions
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59
src/wiphy.c
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@ -126,6 +126,52 @@ enum ie_rsn_cipher_suite wiphy_select_cipher(struct wiphy *wiphy, uint16_t mask)
return 0;
}
static bool wiphy_can_connect_sae(struct wiphy *wiphy)
{
/*
* SAE support in the kernel is a complete mess in that there are 3
* different ways the hardware can support SAE:
*
* 1. Cards which allow SAE in userspace, meaning they support both
* CMD_AUTHENTICATE and CMD_ASSOCIATE as well as advertise support
* for FEATURE_SAE (SoftMAC).
*
* 2. Cards which allow SAE to be offloaded to hardware. These cards
* do not support AUTH/ASSOC commands, do not advertise FEATURE_SAE,
* but advertise support for EXT_FEATURE_SAE_OFFLOAD. With these
* cards the entire SAE protocol as well as the subsequent 4-way
* handshake are all done in the driver/firmware (fullMAC).
*
* 3. TODO: Cards which allow SAE in userspace via CMD_EXTERNAL_AUTH.
* These cards do not support AUTH/ASSOC commands but do implement
* CMD_EXTERNAL_AUTH which is supposed to allow userspace to
* generate Authenticate frames as it would for case (1). As it
* stands today only one driver actually uses CMD_EXTERNAL_AUTH and
* for now IWD will not allow connections to SAE networks using this
* mechanism.
*/
if (wiphy_has_feature(wiphy, NL80211_FEATURE_SAE)) {
/* Case (1) */
if (wiphy->support_cmds_auth_assoc)
return true;
/*
* Case (3)
*
* TODO: No support for CMD_EXTERNAL_AUTH yet.
*/
return false;
} else {
/* Case (2) */
if (wiphy_has_ext_feature(wiphy,
NL80211_EXT_FEATURE_SAE_OFFLOAD))
return true;
return false;
}
}
enum ie_rsn_akm_suite wiphy_select_akm(struct wiphy *wiphy,
struct scan_bss *bss,
bool fils_capable_hint)
@ -188,19 +234,8 @@ enum ie_rsn_akm_suite wiphy_select_akm(struct wiphy *wiphy,
goto wpa2_personal;
}
/*
* TODO: Only SoftMAC (mac80211) drivers are currently
* capable of SAE since it requires ability to send
* Authenticate and Associate frames (which is given by
* support_cmds_auth_assoc). FullMAC drivers require
* SAE offload which we do not support nor supported
* in any upstream driver as of this time.
*/
if (!wiphy_has_feature(wiphy, NL80211_FEATURE_SAE) ||
!wiphy->support_cmds_auth_assoc) {
l_debug("No HW WPA3 support, trying WPA2");
if (!wiphy_can_connect_sae(wiphy))
goto wpa2_personal;
}
if (info.akm_suites &
IE_RSN_AKM_SUITE_FT_OVER_SAE_SHA256)